Shingle Calculator

Calculate how many shingle bundles and roofing squares you need — pitch-aware, with overhangs, openings, waste, and cost estimate.

Building dimensions & overhangs

feet

feet

feet — typical 0.75–1.0 ft

feet

Overhang is assumed on both sides. For a shed roof with overhang on one side only, enter half the value.

Pitch, openings & bundle size

6 = 6:12 pitch (typical). Range: 0–24.

ft² — skylights, chimneys, etc.

ft² per bundle — ≈3 bundles per square

Shingle Calculator — Bundles, Squares & Cost Guide

This calculator converts your roof footprint into sloped area using a pitch factor, subtracts openings, applies waste, and returns roofing squares and bundle count. It also estimates material cost based on shingle type.

What this calculator includes vs. doesn't include

  • Includes: footprint + overhangs, pitch factor, openings, waste, squares, bundles, cost estimate
  • Doesn't include: ridge/hip cap bundles, starter strip, underlayment rolls, ice & water shield, drip edge, flashing

Shingle Cost by Type (2025 US Averages)

Shingle typeMaterial / squareInstalled / square1,500 sq ft roof est.
3-tab asphalt$30–$50$150–$250$2,250–$3,750
Architectural / dimensional$50–$80$200–$350$3,000–$5,250
Impact-resistant (Class 4)$70–$120$250–$400$3,750–$6,000
Designer / premium$80–$150+$300–$500+$4,500–$7,500+
Metal (standing seam)$200–$400$400–$800$6,000–$12,000

Installed cost includes tear-off of one layer, underlayment, flashing, and labor. Prices vary significantly by region — get at least 3 contractor quotes.

Common Pitch Factors (quick reference)

PitchFactorDescriptionArea increase vs flat
2:121.014Low slope (flat-ish)+1.4%
4:121.054Low slope (walkable)+5.4%
6:121.118Moderate (most common)+11.8%
8:121.202Steep residential+20.2%
10:121.302Steep+30.2%
12:121.41445° — very steep+41.4%

How the Calculator Works

Worked Example

40 ft × 24 ft building, 0.75 ft overhangs, 6:12 pitch, 20 ft² openings, 10% waste, 33.3 ft²/bundle:

Frequently Asked Questions

Most standard asphalt shingles require 3 bundles per roofing square (100 sq ft). Calculate your sloped roof area, add 10% waste, divide by 100 for squares, then multiply by 3. The calculator above does this automatically including pitch factor. A 1,500 sq ft footprint at 6:12 pitch needs roughly 50–52 bundles.
One roofing square = 100 sq ft. Standard 3-tab and architectural asphalt shingles are packaged so that 3 bundles cover one square (~33.3 sq ft per bundle). Some premium products run 4 bundles per square — check your wrapper and adjust the bundle coverage field above accordingly.
Architectural asphalt shingles cost $50–$80 per square for materials. Installed (including tear-off, underlayment, flashing, and labor) typically runs $200–$350 per square. A typical 15-square roof costs $3,000–$5,250 installed. See the cost table above for a full breakdown by shingle type.
Use 12–15% for hip roofs due to cut-heavy hips and valleys. Complex roofs with multiple dormers or valleys may need 15–20%. Simple gable roofs with few penetrations can use 10%.
Yes — a steeper roof has more actual surface area than its floor plan footprint. A 6:12 pitch has a factor of 1.118 (11.8% more area than the footprint). A 12:12 pitch has a factor of 1.414 — 41% more. This calculator automatically applies the pitch factor based on your rise-per-12 input.
For large openings, yes — subtract their sloped area. Small penetrations are often not worth subtracting because cut waste around them roughly cancels the material saved. A skylight larger than 10 sq ft is generally worth subtracting.
Ridge and hip cap bundles are not included in this estimate. Measure your total ridge and hip length in linear feet, then check your ridge cap product for coverage per bundle (typically 20–35 linear ft per bundle) to calculate additional bundles needed separately.

Shingle Project Planning Checklist

Reviewed by Caleb Wright. Covers measurements, pitch factors, waste allowance, underlayment, flashing, ventilation, ridge cap, and safety requirements before ordering shingles.

Download Checklist (PDF)

Planning reference only. See Methodology and Data Sources. View all project checklists →

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Accuracy & Review

Reviewed by: Caleb Wright

Caleb validates our roofing calculators, reviewing shingle coverage assumptions, waste factor guidance, and pitch-factor formulas to ensure estimates reflect real-world installation conditions.

Last updated:

See: Methodology · Data Sources · Review Board

Disclaimer: Results are preliminary estimates only and do not replace professional roofing specifications. Quantities may vary based on pitch complexity, local codes, and installation conditions.

See Methodology and Data Sources for calculation details.